Coolant bubbling in to overflow tank? - Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars

Ibicycle · 05-04-2011, 03:26

OK, I hope this isn't a duplicate question. I have searched for it and couldn't find.
99 Ranger, 3.0, air and auto trans.
Coolant is bubbling slowly in to the overflow tank. Eventually if get full and the radiator is low on coolant.
The temperature gauge doesn't indicate an over heat condition in fact the gauge acts as it always has. I have changed the thermostat and radiator cap. Refilled the radiator and ran it with the cap off to purge of air pockets.
Oil looks fine and don't notice and oil in the coolant.
Any ideas?
thanks for any suggestions.

**R.S.LOGAN** · 05-04-2011, 03:36

Might be worthwhile carrying out a block test on head / gasket , especially if cooling system is pressurising . Depends on where gasket blows whether it mixes with oil or not .